Which database does Facebook & Google use ?

Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.

Types of facebook account hacking

There are 5 types generally used to hack accounts :-
1. Facebook Phishing
2. Key logging
3. Social engineering
4. Primary email address hack
5. Cookie Stealing
Facebook phishing:-
I took this method first because this is the most popular method of hacking facebook. I studied various facebook surveys on web about hacking facebook.The results of these surveys show "Phishing" as the most used method to hack facebook and to note :
"Phishing is favorite method of facebook hackers". 
Facebook staff is working hard to avoid these Facebook phishers. Phishing not only allows you to hack Facebook but also almost any email account. You have to only get the trick used to make a phisher, which i think is very easy. I learnt it without any difficulty. But remember, this is only for educational purpose. I will not extend this topic over here as i have added more on Phishing in my
article How to hack facebook password .
Keylogging:-
This is my second favorite, as only thing you have to do is remotely install a keylogger application (if you don't have any physical access to victim computer). Keylogging becomes more easy if you have physical access to victim computer as only thing you have to do is
install a keylogger and direct it to your destination so that it will send all recorded keystrokes to pointed destination. What a keylogger does is it records the keystrokes into a log file and then you can use these logs to get required Facebook password and thus can hack facebook password.
3. Social engineering:-
This sounds to be pretty not working at beginning. Even I was neglecting this way. But I thought of trying it with my friend on Facebook and i got his Facebook password very easily. I think many of you might be knowing what is social engineering , For newbies, social engineering is method of retrieving password or answer of security question simply by querying the victim. You have to be very careful while doing this as victim must not get aware of your intention. Just ask him cautiously using your logic.
4.Primary email address hack :-
If hacker, by some means,hacks your gmail or yahoo account which you have been using as primary email address, then the hacker can easily hack your Facebook password using "Forgot password" option. He will simply request Facebook to send password reset email to your primary email address- which is already hacked. Thus, your Facebook account password will be reset and it will be hacked. So, always remember to protect your Facebook primary email address and try to keep unknown or less used mail id as your primary email address So far, i found these Facebook hacking methods as best and working ways to hack facebook account passwords. I never encourage hacking Facebook or any email account,I just wanna make you aware.
5. Facebook Cookie Stealing :- 
A  method which is being used to hack facebook accounts, which is very effective, Facebook cookie stealing is becoming popular day by day.The cookie which facebook uses to authenticate it's users is called "Datr". If an attacker can get hold on your authentication cookies. All he needs to do is to inject those cookies in his browser and he will gain access to your account. This is how a facebook authentication cookie looks like:
 Cookie: datr=1276721606-b7f94f977295759399293c5b0767618dc02111ede159a827030fc
I will appreciate your effort if you mention any other Facebook hacking method.

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